Prime Minister Lee Hsien Loong explained the benefits of an upgrading programme to some 500 residents on Saturday night, and asked for their support for the works to go forward.

"It won't take many days and I think it'll be worth it," he said to residents of Teck Ghee in Ang Mo Kio GRC, where he is a Member of Parliament and a grassroots adviser.

"I hope you'll give us your support," he said, adding that part of the package would make it easier for less mobile elderly residents to move around within their flats.

Each flat's upgrading will cost about $27,000, said Mr Lee, but 95 per cent will be subsidised by the government.

Mr Lee launched an exhibition and poll on proposed upgrading works to three blocks in Ang Mo Kio Avenue 1. The features include new waste water pipes and ceiling concrete, and optional replacing of metal grilles on doors.

The works - under the Housing Board's Home Improvement Programme - will proceed only if 75 per cent or more of a block's eligible residents vote in favour of it.

Only Singapore citizen households can vote.

Another part of the package is the Enhancement for Active Seniors (Ease) programme which subsidises the retrofitting of flats with elderly-friendly equipment like grab bars, ramps and non-slip bathroom tiles.

The event included a getai variety show and a lucky draw.